Share Different Models of Rotary Drilling Rigs for Different Pile Holes

Factors affecting the selection of rotary drilling rigs are: pile length, pile diameter, geology and special pile type, pile hole has size and depth, geology has simple, complex and soft and hard, seen small piles are 500mm, big piles are 3 meters.

1, small piles can only be hit by small rotary drilling rigs, such as 130, 150, 160 and other models, because the drill pipe is limited;

2、The 550 model rotary drilling rig can also drill 3.5 meters pile hole.

3、Small piles are limited by the drill pipe, big piles are limited by the model, the reasonable size from the center of the drill pipe to the track affects the size of the drill bit that can be loaded. Otherwise, even if it is loaded, it can't be unloaded properly because the slewing will be interfered.

4、Common house construction piles are generally small 600-800 diameter piles. The common model used in house construction piles is about 240 model, there is a certain ability to open the rock, the model is relatively small, the transfer of transportation costs are not high. 600mm piles are generally not recommended to use 280 model to play, because 280 rotary drilling rig drill pipe is 508 drill pipe, if you occasionally use it to play a few shallow piles can be, generally also within 20 meters, too deep easy to jam the rods.

5, high speed rail piles are generally small piles are 1 meter, and for the rock pile, pile depth 30-50 meters. If this kind of pile is not too hard stratum, with 240 model can also hit, but the project department generally small to let on 280 or even at least 360 model, because the project department pursues is the construction efficiency.

6, 280 model rotary drilling rig is recommended to hit the pile small diameter is 700mm piles, large piles are generally 2.5 meters. 360 model is recommended to hit the pile small diameter is 800mm piles, large piles are generally 2.8 meters, if it is the 508 drill pipe to hit the 700mm piles can also be tried. 400 model is recommended to hit the small diameter is 1 meter piles, large piles are generally 3 meters in diameter. 500 and 550 models are recommended to hit the small diameter is 1.2 meters, large piles are generally 3 meters in diameter. 1.2 meters, large pile diameter is generally 3.5 meters.

7, pile size, an important factor affecting equipment selection and pile depth. Before talking about the pile depth, must figure out the pile type belongs to the end-bearing pile, or friction pile.

(1) end bearing piles generally need to enter the rock, into the rock generally refers to the weathered rock layer, into the rock depth is generally 2D, is 2 times the diameter. This type of pile, because it involves rock penetration, generally requires the use of machine locking rods, because the machine locking rods have a strong ability to open the rock. The number of sections of locking rods is generally small, usually 4 sections, and individually there are also 5 sections. 5 sections of locking rods are generally small for 530 drill pipe, if too small, the maintenance rate is very high. Regarding the pile depth, if the pile is into the rock, once more than 65 meters, we should pay attention to the small model generally do not consider, at least with 360 models, if you use 360, you need to use 5 sections of machine lock rod.

(2) Friction piles generally carry strength by friction on the sidewalls, and large bearing capacity is usually realized by large pile diameter and pile depth. Generally there is no need to open the rock, and the drilling rod is usually good with friction rod. 280 and above models usually have 6 sections of friction rod, and below 280 rotary drilling rigs usually have 5 sections. If it is friction pile, once the pile depth is more than 100 meters, you should pay attention to it, because once it is more than 100 meters, it usually needs more than 360 rotary drilling rigs with friction rods, and most of the models above 360 are designed for rock opening, and there are fewer of them with friction rods.

Of course, the pursuit of efficiency, small piles look at the flexibility of rotary drilling rigs, deep piles look at its rope speed, hard piles look at the ability of rotary drilling rigs to open the rock. However, large rotary drilling rigs have strong rock opening ability and large lifting force, but the fuel consumption is relatively large. Complicated geology not only affects the selection, but also need the shroud and even some need to follow up the shroud under.

END